Polarizing film, anti-reflective film and display device including the same

Abstract

An anti-reflective film includes a polarizing film and a compensation film, where the polarizing film includes a polymer, and a plurality of dichroic dyes having an absorption wavelength region in a range from about 380 nanometers to about 780 nanometers, and a reflective color of the anti-reflective film is substantially in a range of −5≦a*≦5 and −5≦b*≦5 in CIE-Lab color coordinates.

What is claimed is:  
     
       1. An anti-reflective film comprising:
 a polarizing film comprising:
 a polymer; and 
 a plurality of dichroic dyes having an absorption wavelength region in a range from about 380 nanometers to about 780 nanometers; and 
 
 a compensation film, 
 wherein a reflective color of the anti-reflective film is substantially in a range of −5≦a* r ≦5 and −5≦b* r ≦5 in CIE-Lab color coordinates, wherein a* r , and b* r , denote a* and b* components of the reflective color of the anti-reflective film in the CIE-Lab color coordinates, respectively, and 
 wherein the polymer comprises a polyolefin, a polyamide, a polyester, a polyacryl, a polystyrene, a copolymer therof, or a combination thereof. 
 
     
     
       2. The anti-reflective film of  claim 1 , wherein
 the plurality of dichroic dyes comprises a plurality of kinds of dichroic dyes having different absorption wavelength regions from one another. 
 
     
     
       3. The anti-reflective film of  claim 2 , wherein the plurality of dichroic dyes comprises at least two selected from:
 at least one kind of a first dichroic dye having a maximum absorption wavelength in a range from about 380 nanometers to about 490 nanometers; 
 at least one kind of a second dichroic dye having a maximum absorption wavelength in a range of more than about 490 nanometers and less than or equal to about 580 nanometers; and 
 at least one of a third dichroic dye having a maximum absorption wavelength in a range of more than about 580 nanometers and less than or equal to about 780 nanometers. 
 
     
     
       4. The anti-reflective film of  claim 2 , wherein the plurality of dichroic dyes comprise a compound represented by the Chemical Formula 1: 
       
         
           
           
               
               
           
         
         wherein, in Chemical Formula 1, 
         Ar 1  to Ar 3  are each independently a substituted or unsubstituted C6 to C15 arylene group, 
         R 1  is a substituted or unsubstituted C1 to C30 aliphatic group, a substituted or unsubstituted C3 to C8 cycloaliphatic group, a substituted or unsubstituted C6 to C30 aromatic group, a substituted or unsubstituted C1 to C30 hetero aliphatic group, a substituted or unsubstituted C3 to C30 hetero aromatic group, or a combination thereof, 
         R 2  is hydrogen, a substituted or unsubstituted C1 to C30 aliphatic group, a substituted or unsubstituted C3 to C8 cycloaliphatic group, a substituted or unsubstituted C6 to C30 aromatic group, a substituted or unsubstituted C1 to C30 hetero aliphatic group, a substituted or unsubstituted C3 to C30 hetero aromatic group, a substituted or unsubstituted amino group, or a combination thereof, and 
         n and m are independently 0 or 1. 
       
     
     
       5. The anti-reflective film of  claim 4 , wherein
 the compound represented by the Chemical Formula 1 is at least one selected from a first dichroic dye having a maximum absorption wavelength in wavelength range of about 380nm to about 490nm, a second dichroic dye having a maximum absorption wavelength in wavelength range of more than about 490nm and less than or equal to about 580nm, and a third dichroic dye having a maximum absorption wavelength in wavelength range of more than about 580nm and less than or equal to about 780nm, depending on n, m, R 1  and R 2  of the Chemical Formula 1, 
 the plurality of the dichroic dyes comprise the first dichroic dye and the second dichroic dye; the first dichroic dye and the third dichroic dye; the second dichroic dye and the third dichroic dye; at least two first dichroic dyes; at least two second dichroic dyes; at least two third dichroic dyes; or the first dichroic dye, the second dichroic dye and the third dichroic dye. 
 
     
     
       6. The anti-reflective film of  claim 5 , wherein
 the dichroic dye is the first dichroic dye when n is 0 or 1 and m is 0, 
 R 1  is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 thioalkyl group, a substituted or unsubstituted C3 to C30 ketone group, a substituted or unsubstituted C1 to C30 oxycarbonyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, or a combination thereof, and 
 R 2  is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, —NR 3 R 4 , or a combination thereof, wherein R 3  and R 4  are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or are linked to each other to form a ring; 
 the dichroic dye is the second dichroic dye when n is 0 or 1 and m is 1, 
 R 1  is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 thioalkyl group, a substituted or unsubstituted C3 to C30 ketone group, a substituted or unsubstituted C1 to C30 oxycarbonyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, or a combination thereof, and 
 R 2  is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, —NR 3 R 4 , or a combination thereof, wherein R 3  and R 4  are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or are linked to each other to form a ring; and 
 the dichroic dye is the third dichroic dye when n and m are  1 , respectively, 
 Ris a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 thioalkyl group, a substituted or unsubstituted C3 to C30 ketone group, a substituted or unsubstituted C1 to C30 oxycarbonyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, or a combination thereof, and 
 R 2  is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, —NR 3 R 4 , or a combination thereof, wherein R 3  and R 4  are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or are linked to each other to form a ring. 
 
     
     
       7. The anti-reflective film of  claim 1 , wherein
 the plurality of dichroic dyes comprises n kinds of dichroic dyes, wherein n is a natural number, and 
 the reflective color of the anti-reflective film satisfies the following Relationship:
     a*   r   =r   1   a*   1   +r   2   a*   2   + . . . +r   n   a*   n ; and 
     b*   r   =r   1   b*   1   +r   2   b*   2   + . . . +r   n   b*   n , 
 
 wherein 
 a* 1  and b* 1  denotes a* and b* components of a reflective color of a first reference polarizing film including a first kind of the n kinds of dichroic dyes at a reference weight in the CIE-Lab color coordinates, respectively, 
 a* 2  and b* 2  denote a* and b* components of a reflective color of a second reference polarizing film including a second kind of the n kinds of dichroic dyes at the reference weight in the CIE-Lab color coordinates, respectively, 
 a* n  and b* n  denote a* and b* components of a reflective color of an n-th reference polarizing film including an n-th kind of the n kinds of dichroic dyes at the reference weight in the CIE-Lab color coordinates, respectively, 
 r 1  denotes a ratio of a weight of the first kind of the n kinds of dichroic dyes in the plurality of dichroic dyes with respect to the reference weight, 
 r 2  denotes a ratio a weight of the second kind of the n kinds of dichroic dyes in the plurality of dichroic dyes with respect to the reference weight, and 
 r n  , denotes a ratio a weight of the n-th kind of the n kinds of dichroic dyes in the plurality of dichroic dyes with respect to the reference weight. 
 
     
     
       8. The anti-reflective film of  claim 1 , wherein the plurality of dichroic dyes is in an amount of about 0.01 part to about 10 parts by weight based on 100 parts by weight of the polymer. 
     
     
       9. The anti-reflective film of  claim 1 , wherein the polymer comprises polyethylene, polypropylene, polyethylene terephthalate, polyethylene terephthalate glycol, polyethylenenaphthalate, nylon, a copolymer thereof, or a combination thereof. 
     
     
       10. The anti-reflective film of  claim 1 , wherein the polarizing film has a dichroic ratio in a range of from about 2 to about 14 at a wavelength range of about 450 nanometers to about 550 nanometers,
 wherein the dichroic ratio satisfies the following Equation:
   DR=Log(1/T ⊥ )/Log(1/T ∥),    
 
 wherein DR denotes the dichroic ratio of the polarizing film, 
 T ∥  denotes light transmittance of the polarization film regarding light polarized parallel to a transmissive axis of the polarization film, and 
 T ⊥  denotes light transmittance of the polarization film regarding light polarized perpendicular to the transmissive axis of the polarization film. 
 
     
     
       11. The anti-reflective film of  claim 1 , wherein the polarizing film has a dichroic ratio in a range of from about 2 to about 14 at a wavelength range of about 380 nanometers to about 650 nanometers,
 wherein the dichroic ratio satisfies the following Equation:
   DR=Log(1 /T   ⊥ )/Log(1 /T   ∥ ), 
 
 wherein 
 DR denotes the dichroic ratio of the polarizing film, 
 T ∥  denotes light transmittance of the polarization film regarding light polarized parallel to a transmissive axis of the polarization film, and 
 T 195   denotes light transmittance of the polarization film regarding light polarized perpendicular to the transmissive axis of the polarization film. 
 
     
     
       12. The anti-reflective film of  claim 1 , wherein the polarizing film has light transmittance greater than or equal to about 30%. 
     
     
       13. The anti-reflective film of  claim 1 , wherein the anti-reflective film has reflectance less than or equal to about 10%. 
     
     
       14. The anti-reflective film of  claim 1 , wherein the polarizing film is a melt-blend of the polymer and the dichroic dye. 
     
     
       15. The anti-reflective film of  claim 1 , wherein the compensation film comprises a λ/4 plate. 
     
     
       16. The anti-reflective film of  claim 1 , wherein a thickness of the polarizing film is less than or equal to about 100 micrometers. 
     
     
       17. A display device comprising:
 a display panel; and 
 an anti-reflective film disposed on a surface of the display panel, 
 wherein the anti-reflective film comprises:
 a polarizing film comprising:
 a polymer; and 
 a plurality of dichroic dyes having an absorption wavelength region in a range of about 380 nanometers to about 780 nanometers; and 
 
 a compensation film, and 
 
 wherein a reflective color of the anti-reflective film is substantially in a range of −5≦a* r ≦5 and −5≦b* r ≦5 in CIE-Lab color coordinates, wherein a* r  and b* r  denote a* and b* components of the reflective color of the anti-reflective film in the CIE-Lab color coordinates, respectively, and 
 wherein the polymer comprises a polyolefin, a polyamide, a polester, a polyacryl, a polystyrene, a copolymer thereof, or a combination thereof. 
 
     
     
       18. The display device of  claim 17 , wherein the plurality of dichroic dyes comprises a plurality of kinds of dichroic dyes having different absorption wavelength regions from one another. 
     
     
       19. The display device of  claim 18 , wherein the plurality of dichroic dyes comprises at least two selected from:
 at least one of a first dichroic dye having a maximum absorption wavelength in a wavelength region of about 380 nanometers to about 490 nanometers; 
 at least one of a second dichroic dye having a maximum absorption wavelength in a wavelength region of more than about 490 nanometers and less than or equal to about 580 nanometers; and 
 at least one of a third dichroic dye having a maximum absorption wavelength in a wavelength region of more than about 580 nanometers and less than or equal to about 780 nanometers. 
 
     
     
       20. The display device of  claim 18 , wherein the plurality of dichroic dyes comprise a compound represented by the Chemical Formula 1: 
       
         
           
           
               
               
           
         
         wherein, in Chemical Formula 1, 
         Ar 1  to Ar 3  are each independently a substituted or unsubstituted C6 to C15 arylene group, 
         R 1  is a substituted or unsubstituted C1 to C30 aliphatic group, a substituted or unsubstituted C3 to C8 cycloaliphatic group, a substituted or unsubstituted C6 to C30 aromatic group, a substituted or unsubstituted C1 to C30 hetero aliphatic group, a substituted or unsubstituted C3 to C30 hetero aromatic group, or a combination thereof, 
         R 2  is hydrogen, a substituted or unsubstituted C1 to C30 aliphatic group, a substituted or unsubstituted C3 to C8 cycloaliphatic group, a substituted or unsubstituted C6 to C30 aromatic group, a substituted or unsubstituted C1 to C30 hetero aliphatic group, a substituted or unsubstituted C3 to C30 hetero aromatic group, a substituted or unsubstituted amino group, or a combination thereof, and 
         n and m are independently 0 or 1. 
       
     
     
       21. The display device of  claim 20 , wherein
 the compound represented by the Chemical Formula 1 is at least one selected from a first dichroic dye having a maximum absorption wavelength in wavelength range of about 380nm to about 490nm, a second dichroic dye having a maximum absorption wavelength in wavelength range of more than about 490nm and less than or equal to about 580nm, and a third dichroic dye having a maximum absorption wavelength in wavelength range of more than about 580 nm and less than or equal to about 780 nm, depending on n, m, R 1  and R 2  of the Chemical Formula 1, 
 the plurality of the dichroic dyes comprise the first dichroic dye and the second dichroic dye; the first dichroic dye and the third dichroic dye; the second dichroic dye and the third dichroic dye; at least two first dichroic dyes; at least two second dichroic dyes; at least two third dichroic dyes; or the first dichroic dye, the second dichroic dye and the third dichroic dye. 
 
     
     
       22. The display device of  claim 21 , wherein
 the dichroic dye is the first dichroic dye when n is 0 or 1 and m is 0, 
 R 1  is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 thioalkyl group, a substituted or unsubstituted C3 to C30 ketone group, a substituted or unsubstituted C1 to C30 oxycarbonyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, or a combination thereof, and 
 R 2  is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, —NR 3 R 4 , or a combination thereof, wherein R 3  and R 4  are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or are linked to each other to form a ring; 
 the dichroic dye is the second dichroic dye when n is 0 or 1 and m is 1, 
 R 1  is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 thioalkyl group, a substituted or unsubstituted C3 to C30 ketone group, a substituted or unsubstituted C1 to C30 oxycarbonyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, or a combination thereof, and 
 R 2  is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, —NR 3 R 4 , or a combination thereof, wherein R 3  and R 4  are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or are linked to each other to form a ring; and 
 the dichroic dye is the third dichroic dye when n and m are 1, respectively, 
 R 1  is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 thioalkyl group, a substituted or unsubstituted C3 to C30 ketone group, a substituted or unsubstituted C1 to C30 oxycarbonyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, or a combination thereof, and 
 R 2  is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, —NR 3 R 4 , or a combination thereof, wherein R 3  and R 4  are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or are linked to each other to form a ring. 
 
     
     
       23. The display device of  claim 17 , wherein
 the plurality of dichroic dyes comprises n kinds of dichroic dyes, and the reflective color of the anti-reflective film satisfies the following relationship:
     a*   r   =r   1   a*   1   +r   2   a*   2   + . . . +r   n   a*   n ; and 
     b*   r   =r   1   b*   1   +r   2   b*   2   + . . . +r   n   b*   n , 
 
 wherein 
 a* 1  and b* 1  denote a* and b* components of a reflective color of a polarizing film including a first kind of the n kinds of dichroic dyes at a reference weight in the CIE-Lab color coordinates, respectively, 
 a* 2  and b* 2  denote a* and b* components of a reflective color of a polarizing film including a second kind of the n kinds of dichroic dyes at the reference weight in the CIE-Lab color coordinates, respectively, 
 a* n  and b* n  denote a* and b* components of a reflective color of a polarizing film including an n-th kind of the n kinds of dichroic dyes at the reference weight in the CIE-Lab color coordinates, respectively, 
 r 1  denotes a ratio of a weight of the first kind of the n kinds of dichroic dyes with respect to the reference weight, 
 r 2  denotes a ratio of a weight of the second kind of the n kinds of dichroic dyes with respect to the reference weight, and 
 r n  denotes a ratio of a weight of the n-th kind of the n kinds of dichroic dyes with respect to the reference weight. 
 
     
     
       24. The display device of  claim 17 , wherein
 the dichroic dye comprises n kinds of dichroic dyes, and a reflective color of the display device satisfies the following Relationship:
     a*   r   =r   1   a*   1   +r   2   a*   2   + . . . +r   n   a*   n ; and 
     b*   r   =r   1   b*   1   +r   2   b*   2   + . . . +r   n   b*   n , 
 
 wherein 
 a* d  and b* d  denote a* and b* components of the reflective color of the display device in the CIE-Lab color coordinates, respectively, 
 a* 1  and b* 1  denote a* and b* components of a reflective color of a first reference polarizing film including a first kind of the n-kinds of dichroic dyes at a reference weight in the CIE-Lab color coordinates, respectively, 
 a* 2  and b* 2  denote a* and b* components of a reflective color of a second reference polarizing film including a second kind of the n-kinds of dichroic dyes in the reference weight in the CIE-Lab color coordinates, respectively, 
 a* n  and b* n  denote a* and b* components of a reflective color of an n-th reference polarizing film including an n-th kind of the n-kinds of dichroic dyes in the reference weight in the CIE-Lab color coordinates, respectively, 
 r 1  denotes a ratio of a weight of the first kind of the n kinds of dichroic dyes in the plurality of dichroic dyes with respect to the reference weight, 
 r 2  denotes a ratio of a weight of the second kind of the n kinds of dichroic dyes in the plurality of dichroic dyes with respect to the reference weight, 
 r n  denotes a ratio of a weight of the n-th kind of the n kinds of dichroic dyes in the plurality of dichroic dyes with respect to the reference weight, and 
 A and B denote a* and b* components of a reflective color of the display panel in the CIE-Lab color coordinates, respectively. 
 
     
     
       25. The display device of  claim 17 , wherein the polymer comprises polyethylene, polypropylene, polyethylene terephthalate, polyethylene terephthalate glycol, polyethylenenaphthalate, nylon, a copolymer thereof, or a combination thereof. 
     
     
       26. The display device of  claim 17 , wherein the polarizing film has a dichroic ratio in a range of from about 2 to about 14 at a wavelength range of from about 450 nanometers to about 550 nanometers,
 wherein the dichroic ratio satisfies the following Equation:
   DR=Log(1 /T   ⊥ )/Log(1 /T   ∥ ), 
 
 wherein 
 DR denotes the dichroic ratio of the polarizing film, 
 T ∥ denotes light transmittance of the polarization film regarding light polarized parallel to a transmissive axis of the polarization film, and 
 T ⊥ denotes light transmittance of the polarization film regarding light polarized perpendicular to the transmissive axis of the polarization film. 
 
     
     
       27. The display device of  claim 17 , wherein
 the polarizing film has a dichroic ratio in a range from about 2 to about 14 in a wavelength ranging from about 380 nanometers to about 650 nanometers, 
 wherein the dichroic ratio satisfies the following Equation:
   DR=Log(1 /T   ⊥ )/Log(1 /T   ∥ ), 
 
 wherein 
 DR denotes a dichroic ratio of the polarizing film, 
 T ∥ denotes light transmittance of a polarization film regarding light polarized parallel to a transmissive axis of the polarization film, and 
 T ⊥ denotes light transmittance of a polarization film regarding light polarized perpendicular to the transmissive axis of the polarization film. 
 
     
     
       28. The display device of  claim 17 , wherein the polarizing film has light transmittance greater than or equal to about 30%. 
     
     
       29. The display device of  claim 17 , wherein the polarizing film is a melt-blend of the polymer and the dichroic dye. 
     
     
       30. The display device of  claim 17 , wherein the display device has reflectance less than or equal to about 10%. 
     
     
       31. The display device of  claim 17 , wherein the compensation film comprises a λ/4 plate. 
     
     
       32. The display device of  claim 17 , wherein a thickness of the polarizing film is less than or equal to about 100 micrometers. 
     
     
       33. The display device of  claim 17 , wherein the display device comprises at least one of an organic light emitting diode display and a liquid crystal display. 
     
     
       34. A polarizing film comprising:
 a polymer; and 
 a plurality of dichroic dyes having an absorption wavelength region of about 380 nanometers to about 780 nanometers, 
 wherein a reflective color of the polarizing film is substantially in a range of −5≦a* p ≦5 and −5≦b p *≦5 in CIE-Lab color coordinates, and a* p  and b* p  denote a* and b* components of the reflective color of the polarizing film in the CIE-Lab color coordinates, resectively, 
 wherein a reflectance of the polarizing film is less than or equal to about 10%, and 
 wherein the polymer comprises a polyolefin, a polyamide, a polyester, a polyacryl, a polystyrene, a copolymer thereof, or a combination thereof. 
 
     
     
       35. The polarizing film of  claim 34 , wherein the plurality of dichroic dyes comprises at least two selected from:
 at least one of a first dichroic dye having a maximum absorption wavelength in a wavelength range of about 380 nanometers to about 490 nanometers; 
 at least one of a second dichroic dye in a wavelength range of more than about 490 nanometers and less than or equal to about 580 nanometers; and 
 at least one of a third dichroic dye in a wavelength range of more than about 580 nanometers and less than or equal to about 780 nanometers. 
 
     
     
       36. The polarizing film of  claim 34 , wherein
 the plurality of dichroic dyes comprise a compound represented by the Chemical Formula 1: 
 
       
         
           
           
               
               
           
         
         wherein, in Chemical Formula 1, 
         Ar 1  to Ar 3  are each independently a substituted or unsubstituted C6 to C15 arylene group, 
         R 1  is a substituted or unsubstituted C1 to C30 aliphatic group, a substituted or unsubstituted C3 to C8 cycloaliphatic group, a substituted or unsubstituted C6 to C30 aromatic group, a substituted or unsubstituted C1 to C30 hetero aliphatic group, a substituted or unsubstituted C3 to C30 hetero aromatic group, or a combination thereof, 
         R 2  is hydrogen, a substituted or unsubstituted C1 to C30 aliphatic group, a substituted or unsubstituted C3 to C8 cycloaliphatic group, a substituted or unsubstituted C6 to C30 aromatic group, a substituted or unsubstituted C1 to C30 hetero aliphatic group, a substituted or unsubstituted C3 to C30 hetero aromatic group, a substituted or unsubstituted amino group, or a combination thereof, and 
         n and m are independently 0 or 1. 
       
     
     
       37. The polarizing film of  claim 36 , wherein
 the compound represented by the Chemical Formula 1 is at least one selected from a first dichroic dye having a maximum absorption wavelength in wavelength range of about 380 nm to about 490 nm, a second dichroic dye having a maximum absorption wavelength in wavelength range of more than about 490 nm and less than or equal to about 580 nm, and a third dichroic dye having a maximum absorption wavelength in wavelength range of more than about 580 nm and less than about 780 nm, depending on n, m, R 1  and R 2  of the Chemical Formula 1, 
 the plurality of the dichroic dyes comprise the first dichroic dye and the second dichroic dye; the first dichroic dye and the third dichroic dye; the second dichroic dye and the third dichroic dye; at least two first dichroic dyes; at least two second dichroic dyes; at least two third dichroic dyes; or the first dichroic dye, the second dichroic dye and the third dichroic dye. 
 
     
     
       38. The polarizing film of  claim 37 , wherein
 the dichroic dye is the first dichroic dye when n is 0 or 1 and m is 0, 
 R 1  is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 thioalkyl group, a substituted or unsubstituted C3 to C30 ketone group, a substituted or unsubstituted C1 to C30 oxycarbonyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, or a combination thereof, and 
 R 2  is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, —NR 3 R 4 , or a combination thereof, wherein R 3  and R 4  are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or are linked to each other to form a ring; 
 the dichroic dye is the second dichroic dye when n is 0 or 1 and m is 1, 
 R 1  is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 thioalkyl group, a substituted or unsubstituted C3 to C30 ketone group, a substituted or unsubstituted C1 to C30 oxycarbonyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, or a combination thereof, and 
 R 2  is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, —NR 3 R 4 , or a combination thereof, wherein R 3  and R 4  are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or are linked to each other to form a ring; and 
 the dichroic dye is the third dichroic dye when n and m are 1, respectively, 
 R 1  is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 thioalkyl group, a substituted or unsubstituted C3 to C30 ketone group, a substituted or unsubstituted C1 to C30 oxycarbonyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, or a combination thereof, and 
 R 2  is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, —NR 3 R 4 , or a combination thereof, wherein R 3  and R 4  are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or are linked to each other to form a ring. 
 
     
     
       39. The polarizing film of  claim 34 , wherein the plurality of dichroic dye comprises n kinds of dichroic dyes, and
 the reflective color of the polarizing film satisfies the following Relationship:
     a*   p   =r   1   a*   1   +r   2   a*   2   + . . . +r   n   a*   n ; and 
     b*   p   =r   1   b*   1   +r   2   b*   2   + . . . +r   n   b*   n , 
 
 wherein 
 a* 1  and b* 1  denote a* and b* components of a reflective color of a first reference polarizing film including a first kind of the n kinds of dichroic dyes at a reference weight in the CIE-Lab color coordinates, respectively, 
 a* 2  and b* 2  denote a* and b* components of a reflective color of a second reference polarizing film including a second kind of the n kinds of dichroic dyes at the reference weight in the CIE-Lab color coordinates, respectively, 
 a* n  and b* n  denote a* and b* components of a reflective color of a n-th reference polarizing film including an n-th kind of the n kinds of dichroic dyes at the reference weight in the CIE-Lab color coordinates, respectively, 
 r 1  denotes a ratio of a weight of the first kind of the n kinds of dichroic dyes in the plurality of dichroic dyes with respect to the reference weight, 
 r 2  denotes a ratio of a weight of the second kind of the n kinds of dichroic dyes in the plurality of dichroic dyes with respect to the reference weight, and 
 r n  denotes a ratio of a weight of the n-th kind of the n kinds of dichroic dyes in the plurality of dichroic dyes with respect to the reference weight. 
 
     
     
       40. The polarizing film of  claim 34 , wherein the plurality of dichroic dyes is in an amount of about 0.01 part to about 10 parts by weight based on 100 parts by weight of the polymer. 
     
     
       41. The polarizing film of  claim 34 , wherein the polymer comprises polyethylene, polypropylene, polyethylene terephthalate, polyethylene terephthalate glycol, polyethylenenaphthalate, nylon, a copolymer thereof, or a combination thereof. 
     
     
       42. The polarizing film of  claim 34 , wherein the polarizing film has light transmittance greater than or equal to about 30%. 
     
     
       43. The polarizing film of  claim 34 , wherein the plurality of dichroic dyes is substantially homogeneously dispersed in the polymer. 
     
     
       44. The polarizing film of  claim 34 , wherein a thickness of the polarizing film is less than or equal to about 100 micrometers.